I never bought BTC, nor crypto; only earned it. In 2017 was the first time I sold for fiat.
After 2-3 more sellings, also in 2017 (last time being in September or October 2017), I never sold again. Nor I intend to do, at least in the close future.
I am just like you, after the next few investments I lost most of my previous interest so I decided from that point on that I didn't dare to risk investing in cryptocurrencies any more.